var user = db.User.Where(u => u.IsShow == true && u.DeleteMark == 0 && u.EnabledMark == 1).OrderBy(_=>Guid.NewGuid()).Take(1);

 var user = db.User.Where(u => u.IsShow == true && u.DeleteMark == 0 && u.EnabledMark == 1).OrderBy(_=>Guid.NewGuid()).Take(10);